Results of IQ tests that are administered should be available
to you now that you're "of age". Just show up and demand
them but it'll probably have to be in person, I imagine. If you
want an IQ test at this point, seek out a School Psychologist
who does intelligence testing on a regular basis (call your
local school district). Or if you've taken the SAT, LSAT,
MCAT, etc., you may be able to find some correlation values
with the WAIS (Wechsler Adult Intelligence Scale) IQ scores.
There are some on-line IQ tests but they're only rough
estimates, of course. They're much more valid when
administered one-on-one (or so they tell me).